Heat exchanger



March A GUNTER HEAT EXCHANGER Filed April 19, 1941 mi 7 W m 5 m: n9 v N9 1 QQ W IINVENTOR 1 Add/Son YGunfier Patented Mar.28, 1945 Addison Y. Gunter, Larchmont, N. Y.-, *assignor to American Locomotive Company, New York,

N. Y., a corporation of New York Application April 19, 1941, Serial No. 389,295

1 Claim. (01. 251-246) This invention relates to heat exchangers. The object of the present invention is to provide a heat exchanger of the shell type having detachable end covers, tubes within the shell spaced one within the other, and outlet and inlet means, the various parts being so associated as to adapt the exchanger for flow of a treating fluid and for series flow of fluid to be treated, and furtherfor certain of the parts to be removable with one of the covers as aunit and for certain other'parts to be removable with the other, cover-as a unit.

Referring to the drawing forming part of this application,.1=igure 1 is a foreshortened vertical longitudinal central section of a heat exchanger embodying the present invention; parts being shown in full and parts being broken away; Fig. 2 is an enlarged section, broken away, of the exchanger of Fig.- 1 on the line IIII thereof; and Fig. 3 is an enlarged end view, broken away, of

the exchanger of Fig. 1, viewed from the right thereof.

Referring generally to the invention, the heat exchanger is not, in all instances, limitedas to its position but as it will ordinarily be disposed in a, horizontal position it is so shown and will be, for convenience, so described. The elements, such as tubes, and chambers and pipes disposed parallel thereto, will therefore be considered with the outer shell'as extending longitudinally in a horizontal direction. The chambers and pipes aforesaid are for the medium.

, The exchanger of the present invention may be used to heat or cool a fluid to be treated or it may heating or cooling fluid be used as a vaporizer, the fluid to be treated in this instance being introduced in liquid form and appropriate inlets and outlets being provided. Or

at corresponding ends are secured to the cover plate 84 thereby closing the adjacent end of the chamber 18.

A pipe 86 is'disposed exteriorly of the tube 15 between two of the fins thereof. The pipe 88 at one end thereof is connected to the chamber 18 at the end thereof remote from the cover plate 84.- The pipe 88 at its other end extends through the cover plate 84 providing an extended portion 81 serving as an inlet for steam or other treating fluid to the chamber 18 The bottom of the chamber 18 at its end adjacent the cover plate 84 is connected to the exterior through an orifice 88 in the cover plate 84, a, pipe fitting 88 and a nipple 88 which serves as a drain .or outlet for condensate, and steam if coming from the chamber 18.

The exchanger is provided with apassage 8| within the bare tube 11 at the end of the exchanger adjacent the cover plate 84, and another passage 82 between the fln-tube 14 and the shell' 8| at the other end of the exchanger for purposes the exchanger may be used as a condenser, the

fluid to be treated in this instance being introduced in vapor form and appropriateinlets and outlets being provided. Of course the heating or cooling treating fluid will also undergo a change which may be heating, cooling, vaporizing or condensing.

The heat exchanger comprises an inner fintube 13, an intermediate fln-tube' 14, and an outer fln-tube 15. Between the fln-tubes 14 and 15 is a bare tube 11, spaced from the tin-tube 15 providing therebetween a. chamber 18. The

shell 8I of the heat exchanger is provided with a adjacent the bolting flange 82 and an inlet 88 flange for oil or other fluid to be treated. A detachable cover plate 84 is secured to the flange by bolts 88. The fln-tube 18' and the bare tube 11 later to appear.

, The cover plate 84 and the parts connected therewith,. as aforedescribed, are easily withdrawn, as a unit, from the shell 8| and other parts of the exchanger. by merely removing the bolts 85.

Between the fin-tubes 18 and 14 is a bare tube 84 spaced from the fln-tube 14 providing therebetween a chamber 86. The shell 8| at its end remote from the flange 82 is provided with another bolting flange 88. A detachable cover plate 88 is secured to the flange88 by bolts I88. Fintube 14 and bare tube 84 are secured to the cover plate 88 thereby closing the adjacent end of the chamber 88. The opposite end of chamber 86 is closed by sealing the adjacent ends of the fintube 14 and'the bare tube 84 together, as clearly 14 between two of the fins thereof. The pipe |8I at one end thereof is connected to the chamber 88 at the end thereof remote from the cover plate 88. The pipe |8I at .itsother end extends through the cover plate 88 providing an extended portion I82 serving asan inlet for steam or other treating fluid to the chamber 86. The

'bottom' of-the chamber 88 at its end adjacent the cover plate 88 is connected to the exterior through an oriflce I83 in the cover plate 88, a pipe fitting I84 and a nipple I85-which serves as any there be,

closing 9. dr pin or outlet for condensate, and steam i! any ..here be, coming from the chamber it.

Cover plate 99 is'provided with an orifice ll! through which the bare tube 84 extends, providing an exterior extended portion I" having at its outer end a bolting flange Ill and an outlet its for the oil or other treated fluid.

I I2, which end may be supported in the fln-tube,

if desired, by suitable supporting means (not shown). A fitting H6 is secured to the cover plate H3 and the pipe Ill extends through this fltting providing an extended portion 1 serving as an inlet for the steam or other treating fluid to the interior of the fin-tube 13. A nipple ill extends from the fltting H6 which serves as an outlet or drain for condensate, or steam if say there be, coming from the fln-tuhe 13.

The operation of the heat exchanger is as follows: Fluid to be treated enters the shell 8! at the inlet 83, flows between the shell" and the fin-tube to the passage 92. From here it flows in the reverse direction between the bare tube 11 and the fln-tube H to the passage 91. From here it flows in the reverse direction between the bare tube 94 and the fln-tube 13 to the outlet I". Thus the fluid to be treated makes three passes in series from the inlet 83 to the outlet I00.

Treating fluid for the first two passes of the fluid to be treated enters the chamber is from the pipe 86, this treating fluid leaving chamber 19 through the nipple 90. Treating fluid for further treating the second pass and for treating the third pass of the fluid to be treated enters chamber 98 from the pipe 10!, this treating fluid leaving chamber 86 through nipple I". The third pass is further treated by the treating fiuid entering the fln-tube 13 from the pipe Hi, this treating fluid leaving fln-tube 13 through nippie H8.

It should be noted that the direction of flow oi the fluid to be treated and oi the treating fluid, or either of them, may be reversed it.

desired. Also any appropriate fluid to be treated and treating fluid may be employed as desired. It will be understood that the various outlet and inlet fittings will'usually-be threaded at their ends for coupling-with other parts (not shown but according to usual practice).

Similar to the manner of withdrawal, as stated. or the cover plate ll and the parts connected therewith, the cover plate Ill and the parts connected therewith, as aioredescribed, are easily withdrawn, as a unit, from bare tube ll by merely removing the bolts III; also the cover plate I! and the parts connected therewith, as aioredescribed, may be similarly withdrawn from the shell II by merely removing the bolts Ill.

While there has been hereinbeiore described an approved embodiment of this invention, it will be understood that many and various changes and modifications in form, arrangement of parts and details of construction thereof may be made without departing from the spirit of the invention, and that all such changes and modifications as all within the scope of the appended claim are contemplated as a part 01' this invention.

The invention claimed and desired to be secured by Letters Patent is: v

A heat exchanger comprising a shell providing a chamber open to the exterior; a detachable cover at each end of said shell; a pair of tubes spaced one within the other within said shell, secured at one end to one of said covers, said space being closed from said chamber and having inlet and outlet means passing through said one oi'said covers, the inner oi said tubes being open at its opposite end-to said chamber; and a second pair of tubes spaced one within the other within said inner tube secured at one end to the other of said covers, said last mentioned space 40 being closed from said chamber and having inlet and outlet means passing through said other cover, the inner 01 said second pair of tubes being open to the exterior and being open at its opposite end to said inner of said first mentioned pair oi. tubes, said covers with their respective tubes and inlet and outlet means being each detachable from said shell as a unit.

ADDISON Y. GUN'IER 

